E and M?

A stream of electrons with velocity \(3\times 10^{7}\text{ m/s}\) is displaced by \(2\text{ mm}\) after travelling \(0.1\text{ m}\) in an electric field of strength \(1800\text{ V/m}\). Find accurate e/m from these values. If your answer is \(x\times 10^{11}\), find \(x\).

Suppose there are \(n\) electrons with mass \(m\) and charge \(e\).

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